Support for microscopy samples.tsv

[Remi-Gau]

I was wondering if it would be possible to add the samples.tsv file to the get_collections function at the "dataset" level At the moment, the "dataset" level seems to only index metadata from participants.tsv.

For example on micr_SPIM with:

subj_df = layout.get_collections(level='dataset', merge=True).to_df()
subj_df

I get the following from participant.tsv, but samples.tsv metadata is not present:

Originally posted by @mariehbourget in https://github.com/bids-standard/pybids/pull/840#pullrequestreview-945892337

[mariehbourget]

Hi @Remi-Gau, I would like to give this a try but I was wondering if it was worth it or if there are plans to do the indexing with the schema instead in the short term? thanks

[Remi-Gau]

I would say that you should go ahead and that things will be adapted "fairly smoothly" (famous last words) when pybids relies on the schema for indexing.

feel free to ping me for PR review